question: i´m from germany and for some stupid regulations, i can´t buy it here on steam. If i buy it here at itch, do i get the patches and sometimes later also the full game?
Patches will not be downloaded automatically, but you don't have to pay for it twice.
If an update was released, come back to this site and on top you will see when you bought the game and how much you paid. Then click on the download-button and will be redirected to a page where you can download the recent version, including patches.
At least this worked for me.